chilly
dry
impassive
philosophic
philosophical
phlegmatic
phlegmatical
stoic
stoical
stolid
unblinking
undemonstrative
affectless
anesthetized
apathetic
arctic
autistic
blunt
callous
catatonic
chill
cold
cold as charity
cold-blooded
coldhearted
cool
dispassionate
drugged
dull
emotionally dead
emotionless
frigid
frosted
frosty
frozen
glacial
hard-boiled
hardhearted
heartless
icy
immovable
impassible
indifferent
inexcitable
insusceptible
nonemotional
obdurate
objective
obscure
obtuse
out of touch
passionless
self-absorbed
soulless
businesslike
impartial
inscrutable
matter-of-fact
noncommittal
prosaic
sane
self-possessed
unconcerned
uneventful
unflappable
unmoved
unperturbed
unreadable
unruffled
unsympathetic
devotional
emotional
promotional
demonstrative
effusive
passionate